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3.1 Engine Vs. 3.4 dohc


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Posted

Is one engine better performance wise than the other? I dont like that Dohc engines seem to need to build up rpm for decent power but turbos have lag which I have noticed NONE so far? There seems to be so many more 3.4 dohc in cars instead of turbo 3.1s? Is one easier to work on than the other? Has anyone raced one against the other?

 

Chris

Posted

This past summer Matt and I raced, he had about half a second on me at the end of the quarter mile.

 

Turbo 3.1s aren't seen as much as the LQ1 for the simple fact that not near as many were made.

 

If your looking for an engine swap, do it right and get the best of both worlds, a turbo 3.4 DOHC

 

Jamie

Posted

That's no opinion. That's fact. Spark plug changes are easier on the LQ1, but they aren't all that bad in a 3.1, either. Other than that, the 3.1 is easier to work on for sure.

Posted

3x00 swap and call it a day..

 

Cheap, reliable, and decent power...... stock that is :lol:

Posted

Upper and lower intake gaskets in less than 1 hour on the 3.4.

 

Pushrod engines- 5 hours, if your damned good, otherwise 8-10+ hours.

 

 

Posted

Upper and lower intake gaskets in less than 1 hour on the 3.4.

 

Pushrod engines- 5 hours, if your damned good, otherwise 8-10+ hours.

 

 

 

Seen them done in 2 hours

Posted

NOTHING is easy about a LQ1 equipped car, even non engine parts are a bitch to replace... see my latest thread about the heater core... If its in the engine bay and you have to work on it, book a day...lol

 

Jamie

Posted

Upper and lower intake gaskets in less than 1 hour on the 3.4.

 

Pushrod engines- 5 hours, if your damned good, otherwise 8-10+ hours.

 

 

 

Seen them done in 2 hours

 

They know tricks, kinda like the 3.4 alternator job, book calls for 4 or 4.5 hours, I can do it in less than 1 hour.

Posted

Ever been able to do plugs in a 98 Expedition in 2.5 hours :wink:

 

yeah, look it up... screw Fords :evil: great, now im gonna have nightmares tonight since I remembered doing that thing :lol:

 

Oh, BTW, 'they know tricks' is talking about me... Not really tricks, but having the correct tools

Posted

I thought you were only a salesperson.

 

Umm, no... I worked as one with AutoZone, but I have also worked on cars on the side... Now I work for Conrad's in Brunswick...

Posted

i havent had many issues with My DOHC. very reliable. the alt is a PITA to do. but i'd rather have a alt that is a pita then the intake gaskets.

the 3.1 turbo vs dohc is a pic of the lesser of two evils!

 

both have limited aftermarket. and arent that common.

 

like said a new 3x00 like a 3400 or 3500 is the best choice tuning will be easer and aftermarket isnt as bad. its just the 3.1 L lacks power in stock form its better to start with a more powerful engine then make it better then start with a lacking engine and then work just to match perf of some other stock motor.

Posted

Ok I was just curious cause I see some many 3.4 DOHC around. I am learning new things everyday.

 

Thanks

Chris

Posted

LQ1's aren't really "common" necessarily, but there are enough of them around to where it's not hard to find one!

Posted

There are always "tricks".

My brother once took his Mazda MX6 to a shop to have the steering rack replaced, he was quoted for 6 hours or something like that because the frame had to be dropped. My brother said fuck that, took it home and had it done in under 2 hours, without lowering the frame at all.

 

On top of tricks you have experience... if someones done a gasket job on a push rod engine many times, of course they are going to be faster at it.

 

Jamie

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